Filter unit for a fume extraction device, and combination appliance having a cooktop and a fume extraction device having a filter unit

ABSTRACT

A filter unit for a fume extraction device includes a filter body having a filter element and a collecting region which is situated below the filter body and at least partially surrounds the filter body for collecting a liquid. An upper region of the filter unit is formed with an air inlet opening to let in air that is suctioned by the fume extraction device, with the air inlet opening at least partially surrounding the filter body. A bottom side of the filter unit is provided with an air outlet opening to let air out of the filter unit to the fume extraction device.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a Continuation of U.S. application Ser. No.15,752,598 filed Feb. 14, 2018, which is a U.S. National Stage ofInternational Application No. PCT/EP2016/068806, filed Aug. 5, 2016,which designated the United States and has been published asInternational Publication No. WO 2017/029138 A1 and which claims thepriority of European Patent Application, Serial No. 15290205.2, filedAug. 19, 2015, pursuant to 35 U.S.C. 119(a)-(d).

BACKGROUND OF THE INVENTION

The present invention relates to a filter unit for a fume extractiondevice and a combination appliance having a cooktop and a fumeextraction device having such a filter unit.

In kitchens, it is known to use so-called downdraft fans instead of fumeextractor hoods which are arranged above a cooktop, for example on theroom wall or ceiling, in order to extract fumes and vapors which areproducing during cooking. Such downdraft ventilation is disclosed, forexample, in DE 10 2013 007 722 A1. In this case, a cooking steam inletopening placed in the cooktop plane is connected via an exhaust channelsystem to a vacuum source. The downdraft ventilation in this case isprovided as a separate appliance between two cooktops or adjacent to acooktop. In order to prevent the entry of liquids into the vacuumsource, it is known to arrange a filter element in the exhaust channelsystem and to provide a trough below the filter element for collectingliquids and other contaminants. A drawback with this known filterarrangement is that liquid which enters the cooking steam inlet openinghas to pass through the filter element before it reaches the trough.

A cooktop with central extraction of cooking fumes in the downwarddirection is also disclosed in WO 2012/146237 A1. In this cooktop, oneor more recesses are incorporated in the region around the geometricsurface center of gravity. Devices are provided below the cooktop forthe extraction of cooking fumes. The devices for the extraction ofcooking fumes are preferably constituted by radial fans which arefastened to the lower face of a cooktop housing and via which air isextracted upwardly out of cooking fume extraction chambers locatedtherebelow. A fat filter insert may be introduced into the recess, thelateral walls of said fat filter insert being permeable to cooking fumesand the bottom thereof forming a collection tray. In this fat filterinsert, although the collection tray is able to serve for receivingliquids, when a filling state of the collection tray which is greaterthan the height thereof is reached, the liquid will again penetrate intothe filter material.

BRIEF SUMMARY OF THE INVENTION

It is the object of the present invention, therefore, to provide asolution by means of which a filter unit is designed both to filtercontaminants and liquids from fumes and vapors and to receive or conductgreater quantities of liquid and, in particular in a combinationappliance consisting of the fume extraction device and cooktop, anoptimized guidance of liquid combined with effective cleaning of thefumes and vapors is ensured by the filter element.

The invention is based on the recognition that this object is able to beachieved by a filter unit being produced in which a collecting regionfor liquids is provided, said collecting region not being covered by thefilter material of the filter element and preferably having at least oneoverflow which is spaced apart from the filter element.

According to a first aspect, therefore, the object is achieved by afilter unit for a fume extraction device, which filter unit comprises atleast one filter body which has at least one filter element and at leastone collecting region for liquids. The filter unit is characterized inthat an air inlet opening is formed on the filter unit in the upperregion, which air inlet opening serves to let in air that is suctionedby the fume extraction device, that an air outlet opening is provided inthe bottom side of the filter unit, which air outlet opening serves tolet air out of the filter unit to the fume extraction device, and thatthe collecting region lies below the at least one filter body and atleast partially surrounds the at least one filter body.

Directional information, such as for example “above” or “below” whichrelate to the filter unit or parts thereof, provided nothing further isspecified, refer to the filter unit in an installed state in which thefilter unit is incorporated in a horizontally located opening of anappliance which comprises a fume extraction device, in particular in ahorizontally located recess of a cooktop. The upper face of the filterunit, therefore, constitutes the suction side and the lower face of thefilter unit constitutes the clean air side. The “upper face of thefilter unit” is preferably understood as the region in which the filterunit bears against the opening of the appliance having the fumeextraction device, in particular the recess of the cooktop. On the upperface of the filter unit, preferably a fastening device may be providedfor fastening the filter unit to an opening of the appliance having thefume extraction device, in particular to a recess in a cooktop. Thefastening device may also be denoted as a mounting device and may, forexample, constitute a bent-back portion or a projection. However, it isalso within the scope of the invention that the filter unit in the upperregion only bears with the outer face thereof on the internal peripheryagainst the opening of the appliance having the fume extraction device,in particular the recess of the cooktop, and the lower face of thefilter unit is positioned on a component in the interior of theappliance, in particular below the cooktop.

According to the invention, the fume extraction device is denoted as adevice by means of which air and, in particular, fumes and vaporproduced during cooking may be extracted from a space above a cooktop.The fume extraction device has at least one blower. The blower, whichmay also be denoted as a fan or suction blower, preferably comprises ablower housing which is designed, for example, as a spiral housing orworm housing and may also be denoted as a fan housing. A fan wheel isreceived in the blower housing, said fan wheel being driven by a motorwhich is also received in the blower housing. The blower housing has anair inlet opening, suctioned air being able to reach the fan wheel viasaid air inlet opening. Moreover, the fan housing comprises an airoutlet opening, air being able to be discharged radially thereby. In ablower which is constituted by a radial blower, the air inlet opening ispreferably located in the region of the axis of the fan wheel.

The filter unit is preferably denoted as a fat filter unit, fats andother contaminants, in particular liquids, being able to be separatedthereby from the air. To this end, the filter unit according to theinvention comprises at least one filter body having at least one filterelement. The filter element may consist of expanded metal layers,braided or knitted metal threads or of other filter materials. Accordingto the present invention, one or more filter elements may be containedin the filter unit. Hereinafter, the invention is substantiallydescribed with reference to one filter element, wherein the embodimentsmade here—provided nothing further is specified—also apply to aplurality of filter elements.

According to the invention, the filter body of the filter unit isunderstood as a contour or a component which extends at least partiallyabove the height of the filter unit and which defines an internal spaceat least on two sides. Preferably, the filter body is sealed at the topand open at the bottom. Therefore, the filter body may, for example, bea frame which has a V-shaped or U-shaped cross section and in whichfilter elements are inserted in openings in one of the two arms of theV-shape or U-shape or in both arms. Alternatively, a tubular filter bodymay also be used, the longitudinal axis thereof being located in thevertical direction of the filter unit and the envelope surface thereofbeing at least partially formed by a filter element. Moreover, it isalso possible to use a filter body which has a rectangular cross sectionand is open at least at the bottom and in which at least one of theouter walls is formed by a filter element. The further regions of theenvelope surfaces or outer surfaces are thus formed by air-impermeablematerial. In the case of a tubular filter body or a filter body having arectangular cross section, preferably the upper face of the filter bodyis closed. This may be implemented by a region of the filter body or bya separate cover.

According to the invention, the filter unit comprises at least onecollecting region for liquids. In this case, the collecting region isdenoted as a contour or a part of the filter unit in which liquids arecollected from the filter element(s) and/or liquids which drain into thefilter element from above. The collecting region is also denotedhereinafter as the collection container. The collecting region may bedesigned as a separate component which may be connected to the filterbody. The collecting region may also be constituted by a separatecomponent relative to a filter holder, the filter unit being able to beheld thereby on the appliance having the fume extraction device.Preferably, however, the collecting region is configured in one piecewith at least one filter holder, i.e. it forms a part of the filterholder. The collecting region is also configured in one piece with thefilter body, in particular in the embodiment in which the filter bodyhas a frame or walls made of air-impermeable material the collectingregion may be configured in one piece with the filter body and, inparticular, the regions thereof which consist of air-impermeablematerial.

An air inlet opening is formed on the filter unit in the upper region,which air inlet opening serving to let in air that is suctioned by thefume extraction device. The air inlet opening in this case is preferablylocated in the upper face of the filter unit but may also be locatedslightly offset downwardly relative to the upper face in the filterunit. The suctioned air thus flows with the air from above according tothe invention into the filter unit. The air inlet opening at leastpartially surrounds the at least one filter body. In particular, in avertical projection of the air inlet opening on the filter body, the airinlet opening is located outside the filter body.

Additionally, an air outlet opening is provided in the bottom side ofthe filter unit, which air outlet opening serving to let air out of thefilter unit to the fume extraction device.

According to the invention, the collecting region is located beneath theat least one filter body and at least partially surrounds the at leastone filter body. The collecting region in this case is preferablyarranged beneath a lower edge of the filter body. “Beneath” in thiscontext means that the collecting region is located in the verticaldirection below the lower edge of the filter body, i.e. is offsetdownwardly. According to the invention, the collecting region may alsobe located in the horizontal direction below the filter body and, inparticular, a lower edge of the filter body, i.e. the verticalprojection of the lower edge of the filter body on the collecting regionmay be preferably located within the surface of the collecting region.By this arrangement of the collecting region a series of advantages maybe achieved. In particular, by the arrangement of the collecting regionwhich is located below the filter body both in the vertical and in thehorizontal direction, it may be ensured that liquids which pass from thefilter element(s) of the filter body, i.e. drain off the filter element,are able to reach the collecting region. Alternatively, however, it isalso possible that the vertical projection of the lower edge of thefilter body is located outside the collecting region, adjacent thereto.

Since the collecting region at least partially surrounds the filterbody, i.e. in vertical plan view it is arranged at least partiallyoutside the filter body or adjacent to the filter body around saidfilter body, and the air inlet opening is also provided outside thefilter body around said filter body, the collecting region is thereforealso accessible to liquids which do not originate from the filterelements of the filter body. The collecting region is preferably locatedat least partially below the air inlet opening. Thus liquids which draininto the filter unit via the air inlet opening of the filter unit but donot reach the filter element(s) may be collected in the collectioncontainer. Additionally, by the arrangement of the collecting regionoutside the filter body it is also possible to divert the liquid, whichis collected in the collecting region, from the collecting regionwithout this liquid having to pass through the filter body and, inparticular, the filter element(s) of the filter body, as is the case inthe prior art.

According to a preferred embodiment, the at least one filter element inthe filter unit is located in a direction which is inclined relative tothe horizontal. This embodiment has the advantage that, due to thealignment of the filter element, liquids which are filtered out in thefilter element run toward the lower edge thereof and from there are ableto reach the collecting region in a reliable manner.

Particularly preferably, the filter element(s) in the filter unit is orare located in the vertical direction. This embodiment has the advantagethat the filter surface of the filter elements is located in thevertical direction and thus is not able to be reached by liquids whichdrain into the filter unit from above via the air inlet opening.Additionally, by this alignment, the filter surface may be maximized fora predetermined size of opening in an appliance having a fume extractiondevice in which the filter unit is incorporated.

According to a preferred embodiment, the filter body forms a hollow bodywhich is open at least at the bottom. A “hollow body” is understoodaccording to the invention as a body which consists of an outer wallwhich may also be denoted as an outer surface or envelope surface andwhich is open on at least one lower face. The hollow body may also bedenoted as a tubular piece or profiled piece, wherein the cross sectionof the tubular piece or profiled piece, for example, may be round orpolygonal, in particular quadrangular. In this case, the at least onefilter element is preferably located in the vertical direction in thefilter body. The filter element(s) in this case may form the entireenvelope surface or outer surface of the hollow body. However, it isalso within the scope of the invention that the filter element(s) formonly a part of the envelope surface or outer surface of the hollow bodyand the further parts of the hollow body are formed by plates or theframe which consist of an air-impermeable material. Since the filterbody forms a hollow body, which is at least partially formed by at leastone of the filter elements which is preferably located in the verticaldirection and which is open at the bottom, air may be suctioned in viathe envelope surfaces or outer surfaces of the hollow body and thefilter surface is thereby increased further for a predetermined size ofa recess in which the filter unit is incorporated.

According to the invention, the cross section of the filter body formedas a hollow body may be round or quadrangular. The shape of the hollowbody in this case is preferably selected according to the shape of theopening in the appliance having the fume extraction device and, inparticular, the recess of a cooktop in which the filter unit isincorporated.

Particularly preferably, in the embodiment of the filter unit with ahollow body as the filter body which is formed at least partially by oneof the filter elements, the hollow body surrounds the air outlet openingof the filter unit. As a result, the air passing through the filterelements is able to reach the air outlet opening directly.

According to one embodiment, the collecting region is constituted by agroove which at least partially surrounds the at least one filter body.In a filter body which is constituted by a hollow body with a continuousenvelope surface or outer surface which is formed by one of more filterelements, the collecting region is preferably an annular groove whichextends around the lower edge of the filter body, i.e. it surrounds saidfilter body. In a filter body which is constituted by a hollow body inwhich only one part of the envelope surface or outer surface of thehollow body is formed by filter elements, the groove may be providedsimply in the region on the lower face of the filter body in which thefilter element(s) is or are provided. In one embodiment of the filterbody which is constituted by a frame bent in a V-shape, the groove maybe provided, for example, merely on the lower faces of the arms of theV-shaped frame.

The advantage of the embodiment of the collecting region as a groove isthat liquids are able to enter the groove over the length thereof and incontrast to a pot-shaped collecting region a further supply line for theliquids is not necessary.

According to a preferred embodiment, the filter unit comprises a filterholder for the filter body, said filter holder at least partiallysurrounding the filter body. In a vertical plan view of the filterholder, the filter holder is preferably located outside the filter bodyand/or intersects with the outer edge of the filter body. Preferably,the bottom of the filter holder constitutes the collecting region of thefilter unit. The at least one filter body in this case is preferablyreceived in the filter holder. This means that at least one part of theheight of the filter body is preferably received in a space formed bythe filter holder.

The “filter holder” in this case is denoted as the part of the filterunit via which the filter unit and, in particular, the filter body maybe held on the opening in the appliance having the fume extractiondevice, in particular on the recess of a cooktop. The filter holder mayalso be denoted as a filter support. Particularly preferably, the filterholder has a trough shape with a bottom opening. On the upper edge ofthe outer walls of the trough shape, a bent-back portion or a furtherfastening device for fastening the filter holder to the appliance may beprovided, in particular in a recess of the cooktop. Around the bottomopening, the trough-shaped filter holder comprises an internal wallwhich extends upwardly. Thus in the bottom of the filter holder agroove-shaped region is formed, preferably continuously around thefilter body, liquids being able to be received and collected therein. Atthe same time, the filter body may be releasably fastened to the cooktopvia the filter holder. Thus the construction of the filter unit issimplified, since the collecting region is also provided by the filterholder at the same time. The filter holder in this embodiment,therefore, may also be denoted as the collection container.Additionally, due to the function of the retention of the filter bodywhich is generally carried out from below, the bottom of the filterholder is located at a lower level than the lower edge of the filterbody. As a result, it is possible for contaminants to drain from thefilter body and, in particular, from the filter element into thecollecting region in a reliable manner.

According to a preferred embodiment, at least one part of the upper edgeof the collecting region forms an overflow edge for the overflow ofliquids. By the provision of an overflow edge, when a large quantity ofliquid passes through the filter unit and collects in the collectioncontainer, it is possible to ensure that the liquid is diverted to adifferent overflow container in a reliable manner. Since the overflowedge is provided on the upper edge of the collecting region, however,initially the space in the collecting region may still be used forcollecting liquids. The liquid will then overflow from the collectingregion only when a filling state is reached which is higher than theoverflow edge.

Preferably, the overflow edge is spaced apart from the at least onefilter element. Arranged “spaced apart from the filter element” isdenoted as an overflow edge which is either offset downwardly relativeto the lower edge of the filter element or which is offset horizontallyrelative to the filter element and preferably relative to the filterbody. In the last case, the overflow edge may be provided, for example,in the outer wall of a filter holder, against which the filter body isheld on an inner wall. Since the overflow edge is spaced apart from thefilter element, the entry of liquids which overflow from the collectingregion over the overflow edge back into the filter element may beprevented.

The overflow edge of the collecting region is preferably formed by atleast one overflow opening. These overflow openings may be incorporated,for example, in the outer wall of a trough-shaped filter holder, againstwhich the filter body is held on an inner wall. The design of theoverflow edge by the provision of openings has the advantage that aconnection is also present between the collecting region and a partwhich is located above the overflow edge, for example the upper part ofa filter holder with the fastening device, and thus the collectingregion together with the filter holder may be fastened to a recess of acooktop and removed therefrom.

The filter unit preferably has a cover which at least covers the atleast one filter body at the top. The cover is constituted by, forexample, a planar plate and therefore may also be denoted as a coverplate. The cover consists of a material which is impermeable both toliquids and air. Thus the cover may, for example, be a metal plate orplastics plate. The cover covers at least the filter body at the top.This means that the entry of air and/or entry of liquid into the upperface of the filter body is prevented. Such a cover is advantageous, inparticular, in embodiments of the filter body in which said filter bodyforms a hollow body and the filter element(s) are provided in theenvelope surface or outer surface of the filter body and the envelopesurface or outer surface preferably extends vertically. In such a filterbody, therefore, an opening is formed in the upper face, said openingbeing surrounded by the envelope surface or outer surface of the filterbody. Without a cover, liquids and air might enter this opening and thusthe air might not be cleaned by the filter elements and the liquidscould penetrate the interior of a blower located below the filter unitand damage said blower. This may be prevented by the provision of acover. According to a preferred embodiment, the size of the cover islarger than the surface of the upper face of the filter body. As aresult, the cover protrudes on at least one side over the edge of theupper face of the filter body. As a result, for example, a filterelement which is arranged in the filter body, such that said filterelement is arranged inclined outwardly from the upper face of the filterbody, may be protected from the direct entry of contaminants and, inparticular, droplets of liquid from above.

The cover is preferably located on the filter body. The cover in thiscase may be fixedly connected to the filter body or releasably connectedto the filter body.

According to one embodiment, the filter unit comprises a positioningelement for positioning the lower edge of the at least one filterelement. The positioning element is configured either as a part of thefilter body or is configured on the filter holder. The “positioningelement” is denoted as an edge or a projection onto which the lower faceof the filter element may be positioned and preferably held. Thepositioning element is preferably provided on the outer face of thecollecting region. The “outer face of the collecting region” in thiscase is denoted as the side which is remote from the interior of thecollecting region in which liquids are received. Particularlypreferably, the positioning element is provided on the side of acollecting region at which this collecting region faces the filter body.By this arrangement of the positioning element, the entry of liquidsfrom the collecting region into the filter element may be reliablyprevented.

The filter element according to the invention may be used for differentfume extraction devices. In particular, however, the filter unit is usedfor fume extraction devices in which air is suctioned from above into anair inlet opening. The blower, therefore, is preferably arranged offsetdownwardly relative to the filter unit. Thus the filter unit may beused, for example, in known downdraft ventilation systems.

According to a further aspect, however, the object is achieved by acombination appliance having a cooktop and a fume extraction devicearranged below the cooktop. The combination appliance is characterizedin that it has at least one filter unit according to the invention.

Advantages and features which have been described relative to the filterunit apply—if practicable—correspondingly to the combination applianceand vice versa and where appropriate are only described once.

The combination appliance according to the invention comprises a cooktopand a fume extraction device. In particular, these two components of thecombination appliance are designed as an assembly unit, i.e. astructural unit. This means that the two components of the combinationappliance are fastened together indirectly or directly and may beinstalled as an assembly unit, for example in a work surface. Thecombination appliance thus constitutes an assembled or premounted unitor a premountable unit.

According to the invention, the cooktop comprises at least one heatingelement and preferably a cover plate. The cover plate covers the atleast one heating element from above. The heating element may beconstituted, for example, by an induction module.

According to the invention, the fume extraction device comprises ablower and preferably additionally an air duct for conducting the airout of the combination appliance after it has exited the blower.

According to the invention, the fume extraction device is arranged belowthe cooktop and, in particular, below the lower face of the cooktop. Ifthe upper face of the cooktop is formed by a cover plate, as preferredaccording to the invention, the fume extraction device is thereforearranged below the cover plate. The blower of the fume extraction devicemay be arranged, for example, between two heating elements of thecooktop or may be located entirely offset downwardly relative to theheating elements.

Directional information, such as “above” and “below”, which is cited inconnection with the combination appliance or parts thereof, refers tothe combination appliance in the assembled and installed state, i.e. inthe state in which this combination appliance is incorporated, forexample, in a horizontal work surface.

Since at least one filter unit according to the invention is used in thecombination appliance according to the invention, a series of advantagesmay be achieved. In particular, by the arrangement according to theinvention of the collecting region in the filter unit, liquids may beprevented from entering into the blower of a fume extraction devicelocated below the cooktop. Additionally, a reliable cleaning of thesuctioned air may be ensured, since the filter body of the filterelement is arranged such that said filter body extends between the airinlet opening and the air outlet opening. The filter surface which isprovided by the filter element(s), which is or are provided in thefilter body, may be maximized thereby.

According to one embodiment, the combination appliance comprises acooktop having at least one recess for extracting air from the spaceabove the cooktop via the at least one recess, and the filter unit isincorporated from above in at least one of the recesses.

According to the invention, at least one recess is provided in thecooktop. The recess may preferably be incorporated in the cover plate ofthe cooktop.

Since according to the invention at least one recess is provided in thecooktop and a filter unit is incorporated therein, a series ofadvantages may be achieved. Firstly, the recess(es) may be incorporatedin the cooktop such that said recess(s) may be located in the vicinityof the heating elements of the cooktop and, as a result, in the vicinityof the point of origin of the fumes and vapors which are designed to beextracted by the fume extraction device. Additionally, in thecombination appliance the blower may be provided directly below therecess and thus the extraction of air from the space above the cooktopmay be further improved. In particular, the filter unit according to theinvention is advantageous in such an arrangement of the blower. By meansof the collecting region which is provided on the filter unit, such thatsaid collecting region at least partially surrounds the filter body andis located below the air inlet opening of the filter unit, liquids whichenter inadvertently, such as boiled over food, are reliably received inthe filter unit and the blower of the fume extraction device is therebyprotected. Finally, since the filter unit is incorporated from aboveinto the recess of the cooktop, the filter unit may be removed in asimple manner, for example for cleaning purposes.

According to a preferred embodiment, the combination appliance comprisesan overflow container which surrounds at least a part of the collectingregion. “Surrounding the collecting region” denotes an overflowcontainer which is arranged at least partially below the collectingregion and which, in a vertical projection of the collecting region onthe overflow container, protrudes at least partially over at least onelateral edge of the collecting region. Preferably, the overflowcontainer is constituted by a trough, a through-opening being providedin the bottom thereof and being surrounded by a protective wall. Theoverflow container is thus preferably formed in the lower region by atleast one groove. The groove may be constituted by a peripheral groove.In a filter body which is surrounded on only two sides by a collectioncontainer, however, the overflow container may also be designed withonly two grooves.

Preferably, the overflow container surrounds at least the part of thecollecting region on which an overflow edge is formed. As a result, areliable supply of liquids to the overflow container may be ensured,said liquids overflowing from the collecting region over the overflowedge.

The overflow container is preferably constituted by a component designedseparately from the filter unit and is fixedly connected to thecombination appliance. The overflow container may be positioned, forexample, onto the blower housing of the blower of the fume extractiondevice. Alternatively, however, it is also possible for the overflowcontainer to be provided on the cooktop, for example the lower face ofthe cooktop, and optionally fastened there. The overflow container ispreferably arranged in the combination appliance such that said overflowcontainer is arranged above the blower of the fume extraction device orat least partially surrounds said blower. The filter unit is releasablyconnected to the combination appliance and may be incorporated, forexample, in a recess of the cooktop and releasably held there. However,it is also within the scope of the invention that the filter unit isincorporated in the overflow container via the recess, and bears againsta part of the overflow container, for example the upper edge of aprotective wall surrounding a through-opening, and thus is held thereon.Since the overflow container is constituted by a separate componentwhich may be incorporated in the combination appliance, the size andposition thereof may be selected such that it is possible to ensure thatthe blower of the fume extraction device is more reliably protectedagainst the entry of liquids. In a blower attached to the bottom of anappliance housing of the combination appliance, the use of the bottom asan overflow container would lead to an entry of the liquids collectedtherein into the blower and thus damage said blower.

According to one embodiment, in each case the collecting region and theoverflow container are groove-shaped. In this case the collecting regionmay be formed by the groove shape, while the groove shape on theoverflow container is configured, for example, only in the lower regionof the overflow container. The width of the groove of the overflowcontainer in this case is preferably larger than the width of the grooveof the collecting region. As a result, the supply of liquids from thecollecting region to the overflow container may be ensured.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is described in more detail once again hereinafter withreference to the accompanying figures, in which:

FIG. 1 shows a schematic perspective plan view of an embodiment of thecombination appliance according to the invention;

FIG. 2 shows a schematic sectional view of the embodiment of thecombination appliance according to the invention along the cutting lineA-A in FIG. 1;

FIG. 3 shows a schematic sectional view of a part of the embodiment ofthe filter unit according to the invention of FIG. 2; and

FIG. 4 shows a schematic sectional view of a second embodiment of thefilter unit according to the invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS OF THE PRESENT INVENTION

An embodiment of a combination appliance 1 according to the invention isshown in FIG. 1. The combination appliance 1 comprises a cooktop 10 anda fume extraction device, not visible in FIG. 1. The combinationappliance 1 is incorporated in a work surface 2. The cooktop 10 isarranged in the upper region of the combination appliance 1. In theembodiment shown, the cooktop 10 comprises a cover plate 103. Heatingelements (see FIG. 2) are arranged below the cover plate 103. The regionof the cover plate 103 in which a heating element 101 is arranged belowthe cover plate 103, i.e. on which food to be cooked may be heated, isalso denoted as the cooking zone 102 or cooking point.

As visible from FIG. 1, a recess 104 is incorporated in the middle ofthe surface of the cooktop 10 and, in particular, in the cover plate103. The recess 104 has a quadrangular cross section and extends overthe middle of the surface of the cover plate 103. In the embodimentshown, the recess 104 extends in the depth direction of the combinationappliance 1.

A cover 15 which covers a part of the recess 104 is provided in therecess 104. The length and width of the cover 15 are in this embodimentsmaller than the length and width of the recess 104. The “length” of therecess 104 and the cover 15, denotes the surface direction which islocated in the depth direction of the combination appliance 1, i.e. inthe direction between the front face and the rear face of thecombination appliance 1. The cover 15 in the first embodiment is locatedin the plane of the cover plate 103. The cover 15 forms the upper faceof a filter body (see FIG. 2) of a filter unit incorporated in therecess 104 (see FIG. 2). Therefore, in the embodiment shown, aperipheral gap is formed between the recess 104 and the cover 15, saidgap forming the air inlet opening 125 of the filter unit 12.

A blower of the fume extraction device of the combination appliance isarranged below the recess 104, not visible in FIG. 1. Via the air inletopening 125 air is suctioned by the fume extraction device into thecombination appliance. The air inlet opening 125 of the filter unit 12thus also forms the suction opening of the combination appliance 1.

In FIG. 2, the embodiment of the combination appliance 1 according tothe invention according to FIG. 1 is shown schematically in sectionalview. In this case, only the parts of the combination appliance 1located in the cutting plane are shown in order to improve the claritythereof. The combination appliance 1 is incorporated in an opening of awork surface 2. The blower 110 of the fume extraction device 11 which isarranged below the recess 104 in the cooktop 10, in particular the coverplate 103, is shown in FIG. 2. Additionally, the filter unit 12 which isarranged between the recess 104 and the blower 110 is visible in FIG. 2.The blower 110 comprises a motor 111 which drives a fan wheel 112. Thefan wheel 112 and the motor 111 are received in a blower housing 113.The blower housing 113 has an air inlet opening 115 on the upwardlyfacing side, i.e. the side facing the cooktop 10. The blower 110 isconstituted by a radial fan in which the air suctioned axially into theblower housing 113 via the air inlet opening 115 is discharged again viaan air outlet opening (not shown) on the blower housing 113 in theradial direction. The air inlet opening 115 of the fan housing 113 isaligned with the recess 104 in the cover plate 103 such that the airinlet opening 115, in a vertical projection of the recess 104 on the airinlet opening 115, is entirely located within the surface of the recess104.

In spite of this alignment of the air inlet opening 115, in the mountedstate of the combination appliance 1 this air inlet opening is notvisible to the user. The filter unit 12 according to the invention isthus arranged above the blower housing 113.

The filter unit 12, which is also shown in more detail in FIG. 3,comprises in the embodiment shown a filter holder 121 and a filter body1200. The filter body 1200 may be designed with the filter holder 121 asa sub-assembly. In any case, however, the filter body 1200 and thefilter holder 121 are connected together. Additionally, the combinationappliance 1 comprises an overflow container 13.

In the embodiment shown, the filter body 1200 is constituted by a hollowbody. At least one filter element 120 is held in the filter body 1200.The filter surfaces of the filter element 120 extend vertically. In theembodiment shown, the filter body 1200 is held on a filter holder 121which has an annular trough shape. The outer walls of the filter holder121 are fastened on their upper face to the cover plate 103. Forexample, the filter holder 121 is able to bear against the cover plate103 via bent-back portions 1211 on the edge of the recess 104 which areoriented outwardly and provided on the upper edge of the outer walls.The outer walls of the filter holder 121 have a height which is greaterthan the height of the filter body 1200. Thus a collecting region 122 isformed in the lower region of the filter holder 121, said collectingregion being located below the filter element 120. In particular, thecollecting region 122 is formed by the connection of the outer wall ofthe filter holder 121 and the inner wall of the filter holder 121 onwhich the filter body 1200 is held, and comprises the bottom of theannular trough of the filter holder 121.

A cover 15 is applied to the upper face of the filter body 1200. Thiscover may be positioned onto the filter element 120 or at leastpartially incorporated in the filter element 120 of hollow design.

The collecting region 122 of the filter holder 121, in a vertical planview of the cooktop 10, covers the gap, i.e. the air inlet opening 125of the filter unit 12 between the cover 15 and the recess 104, i.e. islocated below the air inlet opening 125.

According to the invention, the filter holder 121 may also be designedin one piece with the filter body 1200. In particular, the outer wallsof the filter holder 121, on which preferably bent-back portions 1211are provided for fastening to the cooktop 10, the collecting region 122,which constitutes the bottom of the filter holder 121, and a frame, inwhich the filter element(s) 120 are received, are configured as onepart. In this case the filter elements 120 may be held on the frame, forexample by the shoulder elements 1210 shown in FIG. 3, i.e. appliedthereon or pushed therein. In this case, the frame and the filterelements 120 form the filter body 1200. However, it is also possible forthe filter body 1200 to be designed separately from the filter holder121. In this case, the filter body 1200, for example, may be insertedinto the preferably trough-shaped filter holder 121. Also in thisembodiment the filter holder 1200 may comprise a frame, for example withshoulder elements 1210 for the filter element 120. According to afurther embodiment, however, it is also possible that the filter body1200 is formed exclusively from the filter element(s) 120. In this case,the filter elements 120 are shaped or arranged such that said filterelements form a hollow body which is open at the top and at the bottomand, for example, has a round or rectangular cross section. Also, inthis embodiment a cover 15 is preferably positioned on the filterelement 120.

In the embodiment shown in more detail in FIG. 3, the filter body 1200is formed by the filter element 120. The filter body 1200 and/or thefilter element 120 is held on the filter holder 121. To this end, ashoulder element 1210 is provided on the outer face of the inner wall ofthe filter holder 121 which surrounds the air outlet opening 126 of thefilter unit 12, said shoulder element extending into the air outletopening 126. The filter element 120 is positioned on this shoulderelement 1210 and is held thereon by a projection on the free end of theshoulder element 1210. On the outer wall of the filter holder 121 abent-back portion 1211 is provided on the upper edge, said bent-backportion being oriented outwardly and being able to serve for mountingthe filter unit 12 on the recess 104 of the cooktop 10. One or moreoverflow openings 123 are incorporated in the lower region of the outerwall of the filter holder 121. The lower edge of the overflow opening123 forms the overflow edge 124 via which liquids are able to reach theoverflow container 13. The overflow openings 123 are incorporated at aheight which is level with the upper edge of the inner wall of thefilter holder 121 or is offset downwardly thereto. As a result, it isensured that the height at which the overflow openings 123 areincorporated above the bottom of the filter holder 121 defines themaximum filling level height F of the collecting region 122.

An overflow container 13 is provided between the filter holder 121 andthe blower housing 113 in the embodiment shown. The overflow container13 also has an annular trough shape. The overflow container 13 has alarger width than the filter holder 121. The filter holder 121 isreceived in the overflow container 13, at least in the lower regionthereof in which the collecting region 122 is formed. The overflowcontainer 13 is arranged at a lower level in the combination appliance 1than the filter holder 121. As a result, a spacing is present betweenthe bottom of the overflow container 13 and the collecting region 122 ofthe filter holder 121. At least this spacing serves for receivingliquids.

The filter unit 12 is releasably fastened to the combination appliance1. For example, the filter unit 12 may be introduced into the recess 104and mounted there. The overflow container 13 may be releasably connectedto the combination appliance 1. Thus the overflow container 13, forexample, may be loosely positioned on the blower housing 113 or mountedin the recess. The central through-opening 134, which is produced by theannular shape of the overflow container 13, in this case is aligned withthe air inlet opening 115 of the blower housing 113. The through-opening134 is surrounded by an upwardly extending protective wall 135. Aprotective grille 130 may be provided in the through-opening 134 of theoverflow container 13. However, it is also possible and preferred toconnect the overflow container 13 fixedly, for example to the coverplate 103 or the blower housing 113.

A seal, for example a sealing ring 1212, may be provided between thefilter unit 12 and the cooktop. This sealing ring may be placed aroundthe recess 104 and, for example, the bent-back portion 1211 of thefilter holder 121 may be positioned onto this sealing ring 1212.Moreover, seals 131 and 133 are also shown in FIG. 3, the overflowcontainer 13 being sealed thereby relative to the other elements of thecombination appliance 1. By means of the seal 131, which may beconstituted by a sealing ring received on the upper edge of the overflowcontainer 13, in particular in a sealing slot 132, the overflowcontainer 13 is sealed against the cover plate 103 of the cooktop 10. Bymeans of the seal 133 which is provided on the lower face of theoverflow container 13, the lower face of the overflow container 13 issealed against the blower housing 113. By the provision of seals,firstly an uncontrolled entry of liquids into the combination appliance1 may be prevented and secondly the guidance of air from the air inletopening 125 to the blower 110 may be ensured.

The annular trough shape, which the filter holder 121 and the overflowcontainer 13 preferably comprise, is understood both as a round shapeand a quadrangular shape in plan view. The shape of the filter holder121 and the overflow container 13 are selected according to the shape ofthe recess 104.

In the embodiment according to FIG. 2, an appliance housing 14 of thecombination appliance 1 is also provided in which the fume extractiondevice 11 and the cooktop 10 are received. In the embodiment shown, theheating elements 101 of the cooktop 10 are received in the appliancehousing 14 and the appliance housing 14 is covered from above by thecover plate 103. The fume extraction device 11 is additionally providedin the appliance housing 14. Of the fume extraction device 11, only theblower 110 may be seen in FIG. 2. The blower 110 is fastened to thebottom of the appliance 140 of the appliance housing 14.

As an alternative to the embodiment shown, in which the cooktop 10 andthe fume extraction device 11 are received in an appliance housing 14,according to the invention it is also possible and preferable to designthe combination appliance 1 without the appliance housing 14. In such anembodiment, for example the upper face of the blower 110, for examplethe side in which the air inlet opening 115 is provided, may be fastenedin the region which is located outside the air inlet opening 115 to thelower face of the cooktop, in particular a cooktop housing (not shown).

In the embodiment shown in FIG. 4, in contrast to the first embodimentaccording to FIGS. 1 to 3, the cover 15 is provided at a height which islocated above the plane of the upper face of the cooktop 10, inparticular the cover plate 103. Additionally, in this embodiment theinner walls of the filter holder 121 are configured as inclinedsurfaces. Moreover, the filter element is positioned on the inner wallof the filter holder.

The function of the combination appliance 1 and the filter unit 12 isnow described once again.

In the blower 110 the fan wheel 112 is driven by a motor 111. As aresult, air is suctioned into the blower housing 113 via the air inletopening 115 of the blower housing 113 which faces upwardly and thustoward the cooktop 10. The air in this case is suctioned from above thecooktop 10 through the recess 104 into the combination appliance 1. Inparticular, the air enters through the air inlet opening 125 of thefilter unit 12 between the edge of the recess 104 and the cover 15 intothe combination appliance 1 and is suctioned toward the air inletopening 115 of the blower 110. In this case, the suctioned airflow Lpasses through the filter element 120 from outside to inside. The airthus cleaned is blown out via an air outlet opening (not shown) of theblower housing 113 and from there, either indirectly via an outletchannel (not shown) or directly, reaches an air outlet (not shown) ofthe appliance housing 14. From there, the air may be discharged into thesurroundings or into the space in which the combination appliance 1 isoperated.

Liquids such as water and fat, which are separated on the filter element120 from the air, are able to pass down in the filter element 120. Sincethe filter body 1200 is held by the at least one filter element 120 on afilter holder 121, which has a collecting region 122 below the filterbody 1200, the liquid may be collected there and does not reach theblower 110. If either a large quantity of liquid is separated at thefilter element 120 or liquid enters the combination appliance 1 in largequantities via the air inlet opening 125, for example when foodoverboils, the collecting region 122 of the filter unit 12 initiallyfills up. Overflow openings 123 are incorporated in the filter unit 12,in particular in the outer wall of the filter holder 121. Via theseoverflow openings, the liquid runs into the overflow container 13provided around the filter unit 12.

While the invention has been described substantially with reference tovertically extending filter elements 120, it goes without saying thatother filter elements 120, such as for example horizontally or inclinedfilter elements, may also be used.

A solution is provided by the present invention in which the blower ofthe fume extraction device may be arranged directly below the recess inthe cooktop. Preferably, the recess is of rectangular design and has alongitudinal extent in the depth direction of the cooktop. As a result,the recess and thus the suctioning area run along the cooking zones ofthe cooktop.

The filter unit having the filter element, which may also be denoted asfat filter, is preferably removable from the combination appliance.

Preferably, a collecting region for liquids, which may also be denotedas the liquid container, is provided. Fat or water, which pass throughthe gap between the cover and the recess, may be trapped and collectedin this collecting region. The liquid container is preferably able to beremoved from the combination appliance.

In the event of too large a quantity of liquid entering through the gap,at least one overflow opening, which may also be denoted as an overflowhole, is preferably provided on the collecting region so that thisliquid may flow into an overflow container. The overflow container ispreferably fixedly mounted in the combination appliance and thereforealso denoted as a fixed container. The fixed container is preferably notdismantlable but may be cleaned by hand or emptied from below via anopening.

The filter element, the collecting region and the cover may be a singleunit. Alternatively, however, it is also possible that only the coverand the collecting region form a unit.

The present invention has a series of advantages. In particular, bymeans of the filter unit according to the invention, due to the optionalpositioning of the blower below the recess and the alignment of the airinlet opening upwardly, potentially only one blower is required. Thisblower may be larger and rotate more slowly and thus generate lessnoise. Additionally, the blower may be protected by the filter unit andoptionally an overflow container.

What is claimed is:
 1. A filter unit for a fume extraction device, saidfilter unit comprising: a filter body having a filter element and acollecting region which is situated below the filter body and at leastpartially surrounds the filter body for collecting a liquid, an upperregion formed with an air inlet opening to let in air that is suctionedby the fume extraction device, said air inlet opening at least partiallysurrounding the filter body, and a bottom side provided with an airoutlet opening to let air out of the filter unit to the fume extractiondevice.
 2. The filter unit of claim 1, wherein the filter element islocated in the filter unit in a direction which is inclined relative toa horizontal.
 3. The filter unit of claim 1, wherein the filter elementis located in the filter unit in a vertical direction.
 4. The filterunit of claim 1, wherein the filter body forms a hollow body which isopen at least at the bottom side, said air outlet opening of the filterunit being formed in a lower face of the hollow body.
 5. The filter unitof claim 1, wherein the filter body has a round or quadrangular crosssection.
 6. The filter unit of claim 1, further comprising a filterholder configured to hold the filter body and to at least partiallysurround the filter body, said collecting region constituting a bottomof the filter holder, said filter body being received in the filterholder.
 7. The filter unit of claim 1, wherein the collecting region hasan upper edge which at least in part forms an overflow edge for overflowof liquid, said overflow edge being disposed in spaced-apart relation tothe filter element.
 8. The filter unit of claim 1, further comprising acover configured to at least cover a top of the filter body.
 9. Acombination appliance, comprising: a cooktop, a fume extraction devicearranged below the cooktop, a filter unit comprising a filter bodyhaving a filter element and a collecting region which is situated belowthe filter body and at least partially surrounds the filter body forcollecting a liquid, an upper region formed with an air inlet opening tolet in air that is suctioned by the fume extraction device, said airinlet opening at least partially surrounding the filter body, and abottom side provided with an air outlet opening to let air out of thefilter unit to the fume extraction device, and an overflow containerconfigured to surround at least one part of the collecting region. 10.The combination appliance of claim 9, wherein the at least one part ofthe collecting region forms an overflow edge.
 11. The combinationappliance of claim 9, wherein the overflow container is fixedlyconnected to the combination appliance.